“Tourmaline extraLapis English No. 3: A Gemstone Spectrum” is a textbook published by Lithographie, LTD. in 2002. Written by Gloria Staebler and Gunther Neumeier, this book explores the world of earth sciences and mineralogy, specifically focusing on the properties and characteristics of tourmaline gemstones. With a perfect format and 100 pages of informative content, this book serves as a valuable resource for those interested in the science of gemstones and the beauty they hold.